A way to do so is to exit at the same price as you have entered. This works best with a Staible Coin Combination (CUB/BUSD for example). The best thing about LPs are their high APRs. The rewards are so high that you would like to stay as long as possible in the farms to earn the most. When you pair two Altcoins you have to watch the LP-Token Value as a whole - this works best with DApps like yieldwatch for example.
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P.S.: If you want a Farm with the safty of a Den take the USDT/BUDT Farm.